There are currently 24,939,352 Oyster cards in circulation that have not been used in a year or more. That's £46,631,475 worth of deposits.
More top news
Madame Tussauds London has announced the arrival of a very high-profile guest who will take up a two-week residency over October half-term.
The Mayor of London Sadiq Khan has called for an end to online abuse against politicians.
The Football Association has called on the police and social media companies to help shut down online abuse.